1) Tetrahedron: Asymmetry
Volume 17, Issue 18, 16 October 2006, Pages 2642-2648
Chiral NMR discrimination of pyrrolidines using (18-crown-6)-2,3,11,12-tetracarboxylic acid
Ann E. Lovelya and Thomas J. Wenzel
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http://dx.doi.org/10.1016/j.tetasy.2006.10.002